I love my Keurig! When we lived on the farm (well water) I had to descale often (with vinegar), and the head clogged often - had to poke a straightened-out paper clip up into where the heated water bursts out. When we moved to town, and using the filtered water from the fridge, I have not yet had to descale, and have had no clogs!
We have some go-to flavours but also enjoy the specialty flavours, as well as apple cider and tea.
I found the cups that you fill with your own grind, didn't clean out and didn't taste as nice. But I didn't experiment with different grinds either.